نتایج جستجو برای: niche
تعداد نتایج: 21602 فیلتر نتایج به سال:
the neoplastic niche comprises complex interactions between multiple cell types and molecules requiring cell-cell signaling as well as local secretion. these niches are important for both the maintenance of cancer stem cells and the induction of neoplastic cells survival and proliferation. each niche contains a population of tumor stem cells supported by a closely associated vascular bed compri...
Looming establishment of competitive environment on the globe imposes serious competitive challenges on domestic industries in a way that it affects their business trends or even their survival. Seemingly, starting and choosing niche markets can be effective solution to retain and grow the market share, and consequently gain success in competitive environments. Meanwhile, due to high compe...
the aim of the current study was to explain the way culture influences the development of children based on the theory of developmental niche. for this, a library based method was conducted. the current research concluded that culture organizes the environmental factors influencing child development. hence, organized factors impact development more likely than unorganized ones. the theory gives...
Mountain vipers of the genus Montivipera, generally, and the species of the Raddei clade, specifically, are interesting examples of species neo-endemism in Iran, Anatolia, and the Caucasus. Given the critical conservation status of these species, it is necessary to identify their suitable habitats for prioritizing conservation measures. We modeled ecological niche of each species based on four ...
Variation along the successional stage of a plant community is not limited to plant composition and diversity but also related to nutrient resources and plant species abundance distribution. Therefore, the use of models that consider the distribution of ecological niches in addition to the relative frequency of species in the distribution of species is also important. The object of current stud...
Species relative abundance have closely related to ecological niche of plant communities. The broader specie ecological niche for food sources the greater relative abundance of plant species. Species abundance distributions models can be are divided into two groups Statistical and biological models. In this study we aimed to investigate how animal grazing (Long time grazing exclusion, Grazing a...
this study evaluated the histopathologic changes in the round window niche. , and membrane in cases of chronic suppurative otitis media. the pathologic process was found in all subjects. fibrocystic or fibrous tissue was most commonly seen, while active granulation was less developed. the round window membrane was thicker and inflamed throughout its layers. inflammatory invasion of the inner ea...
numbers of persian leopards have considerably decreased in recent years and for this reason it has been categorized as endangered in the iucn classification. habitat destruction is believed to be the main cause of the species population decline. hence, attempts to preserve the remaining habitats of this kind of animal effectively are deemed essential in reversing its downgrading trend. to hit t...
background: niche cells, regulating spermatogonial stem cells (sscs) fate are believed to have a reciprocal communication with sscs. the present study was conducted to evaluate the effect of ssc elimination on the gene expression of glial cell line-derived neurotrophic factor (gdnf), fibroblast growth factor 2 (fgf2) and kit ligand (kitlg), which are the main growth factors regulating sscs deve...
eastern rock nuthatch (sitta tephronota) and western rock nuthatch (s. neumayer) are two closely related and sympatric species in iran, which have been known as the classical case of character displacement since 1950. nevertheless, some questions related their niche partitioning is still unanswered. this study was conducted to determine the diet differentiation, as an important niche dimension,...
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